"""通知服务：Telegram / 邮件多渠道发送

根据 .env 配置的渠道发送通知。未配置的渠道自动跳过。
"""

import smtplib
from email.mime.text import MIMEText

import httpx

from app.core.config import settings


def send_telegram(message: str) -> dict:
    """通过 Telegram Bot 发送消息"""
    if not settings.TELEGRAM_BOT_TOKEN or not settings.TELEGRAM_CHAT_ID:
        return {"ok": False, "channel": "telegram", "message": "未配置 Telegram"}
    url = f"https://api.telegram.org/bot{settings.TELEGRAM_BOT_TOKEN}/sendMessage"
    try:
        resp = httpx.post(
            url,
            json={
                "chat_id": settings.TELEGRAM_CHAT_ID,
                "text": message,
                # 不传 parse_mode：消息里嵌的是资产名/平台名等用户数据，
                # 含 < > & 时 HTML 解析会让整条消息 400 失败（提醒根本发不出去），
                # 而纯文本提醒本来也不需要任何标签
                "disable_web_page_preview": True,
            },
            timeout=15,
        )
        resp.raise_for_status()
        return {"ok": True, "channel": "telegram", "message": "发送成功"}
    except httpx.HTTPStatusError as e:
        # Telegram 把拒收原因放在响应体里（bot 被拉黑、chat_id 错等），
        # 只留状态码无法排查，把正文一并带回
        return {
            "ok": False,
            "channel": "telegram",
            "message": f"HTTP {e.response.status_code}：{e.response.text[:200]}",
        }
    except Exception as e:  # noqa: BLE001
        return {"ok": False, "channel": "telegram", "message": str(e)}


def send_email(message: str, subject: str = "资产续费提醒") -> dict:
    """通过 SMTP 发送邮件"""
    if not settings.SMTP_HOST or not settings.SMTP_USER:
        return {"ok": False, "channel": "email", "message": "未配置邮件"}
    try:
        msg = MIMEText(message, "plain", "utf-8")
        msg["Subject"] = subject
        msg["From"] = settings.SMTP_FROM or settings.SMTP_USER
        msg["To"] = settings.SMTP_TO or settings.SMTP_USER
        with smtplib.SMTP_SSL(settings.SMTP_HOST, settings.SMTP_PORT, timeout=15) as server:
            server.login(settings.SMTP_USER, settings.SMTP_PASSWORD)
            server.send_message(msg)
        return {"ok": True, "channel": "email", "message": "发送成功"}
    except Exception as e:  # noqa: BLE001
        return {"ok": False, "channel": "email", "message": str(e)}


def notify(message: str, subject: str = "资产续费提醒") -> list:
    """发送到所有已配置的渠道，返回各渠道结果"""
    results = []
    if settings.TELEGRAM_BOT_TOKEN:
        results.append(send_telegram(message))
    if settings.SMTP_HOST:
        results.append(send_email(message, subject))
    if not results:
        results.append({"ok": False, "channel": "none", "message": "未配置任何通知渠道"})
    return results


def configured_channels() -> list:
    """返回已配置的通知渠道列表"""
    channels = []
    if settings.TELEGRAM_BOT_TOKEN and settings.TELEGRAM_CHAT_ID:
        channels.append("telegram")
    if settings.SMTP_HOST and settings.SMTP_USER:
        channels.append("email")
    return channels